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Box and Whisker Plots Help

A Box and Whisker plot is used to present a visual representation of how data are spread out and how much variation there is in the data. It focuses attention on the median, the quartile, and the minimum and maximum values. The example below demonstrates how to use the Box and Whisker plot in SPC for Excel.

You are interested in comparing the average monthly temperature for three cities. The Box and Whisker plot can show this variation. The data you have is shown below.

Box and Whisker Plot Output

The program will plot outliers and color them red.

The calculations for the Box-Whisker plot are shown here.

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